/Engine/Source/Runtime/Engine/Public/ImageUtils.h
Resizes the given image using a simple average filter and stores it in the destination array. This version constrains aspect ratio. Accepts TArrayViews but requires that DstData be pre-sized appropriately
static void ImageResize ( int32 SrcWidth, int32 SrcHeight, const TArrayView64< const [FLinearColor](API\Runtime\Core\Math\FLinearColor) > & SrcData, int32 DstWidth, int32 DstHeight, const TArrayView64< [FLinearColor](API\Runtime\Core\Math\FLinearColor) > & DstData )